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GH-35202: [Go][Parquet] Fix panic reading nested empty list (#35276)


### What changes are included in this PR?
A simple check in the struct reader to validate that we're trying to read something with at least one child before we start trying to build a nullbitmap that wouldn't exist if there are 0 elements in the actual array.

### Are these changes tested?
Yes a unit test is included in this change.

* Closes: #35202

Authored-by: Matt Topol <zotthewizard@gmail.com>
Signed-off-by: Matt Topol <zotthewizard@gmail.com>